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[gnulib.git] / tests / test-frexpl.c

diff --git a/tests/test-frexpl.c b/tests/test-frexpl.c
index f98fcf1..ccb547b 100644 (file)
--- a/tests/test-frexpl.c
+++ b/tests/test-frexpl.c
@@ -1,10 +1,10 @@
 /* Test of splitting a 'long double' into fraction and mantissa.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007-2011 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -12,8 +12,7 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
 
@@ -21,10 +20,34 @@
 
 #include <math.h>
 
+#include "signature.h"
+SIGNATURE_CHECK (frexpl, long double, (long double, int *));
+
 #include <float.h>
-#include <stdlib.h>
 
-#define ASSERT(expr) if (!(expr)) abort ();
+#include "fpucw.h"
+#include "isnanl-nolibm.h"
+#include "minus-zero.h"
+#include "nan.h"
+#include "macros.h"
+
+/* Avoid some warnings from "gcc -Wshadow".
+   This file doesn't use the exp() function.  */
+#undef exp
+#define exp exponent
+
+/* On MIPS IRIX machines, LDBL_MIN_EXP is -1021, but the smallest reliable
+   exponent for 'long double' is -964.  Similarly, on PowerPC machines,
+   LDBL_MIN_EXP is -1021, but the smallest reliable exponent for 'long double'
+   is -968.  For exponents below that, the precision may be truncated to the
+   precision used for 'double'.  */
+#ifdef __sgi
+# define MIN_NORMAL_EXP (LDBL_MIN_EXP + 57)
+#elif defined __ppc || defined __ppc__ || defined __powerpc || defined __powerpc__
+# define MIN_NORMAL_EXP (LDBL_MIN_EXP + 53)
+#else
+# define MIN_NORMAL_EXP LDBL_MIN_EXP
+#endif
 
 static long double
 my_ldexp (long double x, int d)
@@ -41,13 +64,16 @@ main ()
 {
   int i;
   long double x;
+  DECL_LONG_DOUBLE_ROUNDING
+
+  BEGIN_LONG_DOUBLE_ROUNDING ();
 
   { /* NaN.  */
     int exp = -9999;
     long double mantissa;
-    x = 0.0L / 0.0L;
+    x = NaNl ();
     mantissa = frexpl (x, &exp);
-    ASSERT (mantissa != mantissa);
+    ASSERT (isnanl (mantissa));
   }
 
   { /* Positive infinity.  */
@@ -73,15 +99,17 @@ main ()
     mantissa = frexpl (x, &exp);
     ASSERT (exp == 0);
     ASSERT (mantissa == x);
+    ASSERT (!signbit (mantissa));
   }
 
   { /* Negative zero.  */
     int exp = -9999;
     long double mantissa;
-    x = -0.0L;
+    x = minus_zerol;
     mantissa = frexpl (x, &exp);
     ASSERT (exp == 0);
     ASSERT (mantissa == x);
+    ASSERT (signbit (mantissa));
   }
 
   for (i = 1, x = 1.0L; i <= LDBL_MAX_EXP; i++, x *= 2.0L)
@@ -91,7 +119,7 @@ main ()
       ASSERT (exp == i);
       ASSERT (mantissa == 0.5L);
     }
-  for (i = 1, x = 1.0L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+  for (i = 1, x = 1.0L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L)
     {
       int exp = -9999;
       long double mantissa = frexpl (x, &exp);
@@ -113,7 +141,7 @@ main ()
       ASSERT (exp == i);
       ASSERT (mantissa == -0.5L);
     }
-  for (i = 1, x = -1.0L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+  for (i = 1, x = -1.0L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L)
     {
       int exp = -9999;
       long double mantissa = frexpl (x, &exp);
@@ -135,7 +163,7 @@ main ()
       ASSERT (exp == i);
       ASSERT (mantissa == 0.505L);
     }
-  for (i = 1, x = 1.01L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+  for (i = 1, x = 1.01L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L)
     {
       int exp = -9999;
       long double mantissa = frexpl (x, &exp);
@@ -159,7 +187,7 @@ main ()
       ASSERT (exp == i);
       ASSERT (mantissa == 0.866025L);
     }
-  for (i = 1, x = 1.73205L; i >= LDBL_MIN_EXP; i--, x *= 0.5L)
+  for (i = 1, x = 1.73205L; i >= MIN_NORMAL_EXP; i--, x *= 0.5L)
     {
       int exp = -9999;
       long double mantissa = frexpl (x, &exp);